About the Doom shirt I have, I love it and all but one thing bothers me: the quality of the fabric used for it feels just like the fabric from some of the cheap $5 shirts I have Come on Bethesda and ID, you could have invested in a slightly better shirt fabric, especially since the Doom community has given back so much in terms of maps, mods and source ports (Made in China, go figure).
Even some of my extreme metal band t-shirts I paid $12-20 for have higher quality fabric and yet I feel a bit gouged/miffed for paying a total of $25 for a cheap shirt with the Doom box art logo on it.
TL;DR shirt fabric is really cheap feeling and Bethesda should feel ashamed